src/mesa/main/pixel.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file pixel.c
  28  * Pixel transfer functions (glPixelZoom, glPixelMap, glPixelTransfer)
  29  */
  30
  31 #include "glheader.h"
  32 #include "bufferobj.h"
  33 #include "colormac.h"
  34 #include "context.h"
  35 #include "macros.h"
  36 #include "pixel.h"
  37 #include "mtypes.h"
  38 #include "main/dispatch.h"
  39
  40
  41 #if FEATURE_pixel_transfer
  42
  43
  44 /**********************************************************************/
  45 /*****                    glPixelZoom                             *****/
  46 /**********************************************************************/
  47
  48 static void GLAPIENTRY
  49 _mesa_PixelZoom( GLfloat xfactor, GLfloat yfactor )
  50 {
  51    GET_CURRENT_CONTEXT(ctx);
  52
  53    if (ctx->Pixel.ZoomX == xfactor &&
  54        ctx->Pixel.ZoomY == yfactor)
  55       return;
  56
  57    FLUSH_VERTICES(ctx, _NEW_PIXEL);
  58    ctx->Pixel.ZoomX = xfactor;
  59    ctx->Pixel.ZoomY = yfactor;
  60 }
  61
  62
  63
  64 /**********************************************************************/
  65 /*****                         glPixelMap                         *****/
  66 /**********************************************************************/
  67
  68 /**
  69  * Return pointer to a pixelmap by name.
  70  */
  71 static struct gl_pixelmap *
  72 get_pixelmap(GLcontext *ctx, GLenum map)
  73 {
  74    switch (map) {
  75    case GL_PIXEL_MAP_I_TO_I:
  76       return &ctx->PixelMaps.ItoI;
  77    case GL_PIXEL_MAP_S_TO_S:
  78       return &ctx->PixelMaps.StoS;
  79    case GL_PIXEL_MAP_I_TO_R:
  80       return &ctx->PixelMaps.ItoR;
  81    case GL_PIXEL_MAP_I_TO_G:
  82       return &ctx->PixelMaps.ItoG;
  83    case GL_PIXEL_MAP_I_TO_B:
  84       return &ctx->PixelMaps.ItoB;
  85    case GL_PIXEL_MAP_I_TO_A:
  86       return &ctx->PixelMaps.ItoA;
  87    case GL_PIXEL_MAP_R_TO_R:
  88       return &ctx->PixelMaps.RtoR;
  89    case GL_PIXEL_MAP_G_TO_G:
  90       return &ctx->PixelMaps.GtoG;
  91    case GL_PIXEL_MAP_B_TO_B:
  92       return &ctx->PixelMaps.BtoB;
  93    case GL_PIXEL_MAP_A_TO_A:
  94       return &ctx->PixelMaps.AtoA;
  95    default:
  96       return NULL;
  97    }
  98 }
  99
 100
 101 /**
 102  * Helper routine used by the other _mesa_PixelMap() functions.
 103  */
 104 static void
 105 store_pixelmap(GLcontext *ctx, GLenum map, GLsizei mapsize,
 106                const GLfloat *values)
 107 {
 108    GLint i;
 109    struct gl_pixelmap *pm = get_pixelmap(ctx, map);
 110    if (!pm) {
 111       _mesa_error(ctx, GL_INVALID_ENUM, "glPixelMap(map)");
 112       return;
 113    }
 114
 115    switch (map) {
 116    case GL_PIXEL_MAP_S_TO_S:
 117       /* special case */
 118       ctx->PixelMaps.StoS.Size = mapsize;
 119       for (i = 0; i < mapsize; i++) {
 120          ctx->PixelMaps.StoS.Map[i] = (GLfloat)IROUND(values[i]);
 121       }
 122       break;
 123    case GL_PIXEL_MAP_I_TO_I:
 124       /* special case */
 125       ctx->PixelMaps.ItoI.Size = mapsize;
 126       for (i = 0; i < mapsize; i++) {
 127          ctx->PixelMaps.ItoI.Map[i] = values[i];
 128       }
 129       break;
 130    default:
 131       /* general case */
 132       pm->Size = mapsize;
 133       for (i = 0; i < mapsize; i++) {
 134          GLfloat val = CLAMP(values[i], 0.0F, 1.0F);
 135          pm->Map[i] = val;
 136          pm->Map8[i] = (GLint) (val * 255.0F);
 137       }
 138    }
 139 }
 140
 141
 142 /**
 143  * Convenience wrapper for _mesa_validate_pbo_access() for gl[Get]PixelMap().
 144  */
 145 static GLboolean
 146 validate_pbo_access(GLcontext *ctx, struct gl_pixelstore_attrib *pack,
 147                     GLsizei mapsize, GLenum format, GLenum type,
 148                     const GLvoid *ptr)
 149 {
 150    GLboolean ok;
 151
 152    /* Note, need to use DefaultPacking and Unpack's buffer object */
 153    _mesa_reference_buffer_object(ctx,
 154                                  &ctx->DefaultPacking.BufferObj,
 155                                  pack->BufferObj);
 156
 157    ok = _mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
 158                                   format, type, ptr);
 159
 160    /* restore */
 161    _mesa_reference_buffer_object(ctx,
 162                                  &ctx->DefaultPacking.BufferObj,
 163                                  ctx->Shared->NullBufferObj);
 164
 165    if (!ok) {
 166       _mesa_error(ctx, GL_INVALID_OPERATION,
 167                   "glPixelMap(invalid PBO access)");
 168    }
 169    return ok;
 170 }
 171
 172
 173 static void GLAPIENTRY
 174 _mesa_PixelMapfv( GLenum map, GLsizei mapsize, const GLfloat *values )
 175 {
 176    GET_CURRENT_CONTEXT(ctx);
 177    ASSERT_OUTSIDE_BEGIN_END(ctx);
 178
 179    /* XXX someday, test against ctx->Const.MaxPixelMapTableSize */
 180    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 181       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 182       return;
 183    }
 184
 185    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 186       /* test that mapsize is a power of two */
 187       if (!_mesa_is_pow_two(mapsize)) {
 188          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 189          return;
 190       }
 191    }
 192
 193    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 194
 195    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize,
 196                             GL_INTENSITY, GL_FLOAT, values)) {
 197       return;
 198    }
 199
 200    values = (const GLfloat *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 201    if (!values) {
 202       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 203          _mesa_error(ctx, GL_INVALID_OPERATION,
 204                      "glPixelMapfv(PBO is mapped)");
 205       }
 206       return;
 207    }
 208
 209    store_pixelmap(ctx, map, mapsize, values);
 210
 211    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 212 }
 213
 214
 215 static void GLAPIENTRY
 216 _mesa_PixelMapuiv(GLenum map, GLsizei mapsize, const GLuint *values )
 217 {
 218    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 219    GET_CURRENT_CONTEXT(ctx);
 220    ASSERT_OUTSIDE_BEGIN_END(ctx);
 221
 222    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 223       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 224       return;
 225    }
 226
 227    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 228       /* test that mapsize is a power of two */
 229       if (!_mesa_is_pow_two(mapsize)) {
 230          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 231          return;
 232       }
 233    }
 234
 235    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 236
 237    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize,
 238                             GL_INTENSITY, GL_UNSIGNED_INT, values)) {
 239       return;
 240    }
 241
 242    values = (const GLuint *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 243    if (!values) {
 244       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 245          _mesa_error(ctx, GL_INVALID_OPERATION,
 246                      "glPixelMapuiv(PBO is mapped)");
 247       }
 248       return;
 249    }
 250
 251    /* convert to floats */
 252    if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
 253       GLint i;
 254       for (i = 0; i < mapsize; i++) {
 255          fvalues[i] = (GLfloat) values[i];
 256       }
 257    }
 258    else {
 259       GLint i;
 260       for (i = 0; i < mapsize; i++) {
 261          fvalues[i] = UINT_TO_FLOAT( values[i] );
 262       }
 263    }
 264
 265    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 266
 267    store_pixelmap(ctx, map, mapsize, fvalues);
 268 }
 269
 270
 271 static void GLAPIENTRY
 272 _mesa_PixelMapusv(GLenum map, GLsizei mapsize, const GLushort *values )
 273 {
 274    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 275    GET_CURRENT_CONTEXT(ctx);
 276    ASSERT_OUTSIDE_BEGIN_END(ctx);
 277
 278    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 279       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapusv(mapsize)" );
 280       return;
 281    }
 282
 283    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 284       /* test that mapsize is a power of two */
 285       if (!_mesa_is_pow_two(mapsize)) {
 286          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 287          return;
 288       }
 289    }
 290
 291    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 292
 293    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize,
 294                             GL_INTENSITY, GL_UNSIGNED_SHORT, values)) {
 295       return;
 296    }
 297
 298    values = (const GLushort *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 299    if (!values) {
 300       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 301          _mesa_error(ctx, GL_INVALID_OPERATION,
 302                      "glPixelMapusv(PBO is mapped)");
 303       }
 304       return;
 305    }
 306
 307    /* convert to floats */
 308    if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
 309       GLint i;
 310       for (i = 0; i < mapsize; i++) {
 311          fvalues[i] = (GLfloat) values[i];
 312       }
 313    }
 314    else {
 315       GLint i;
 316       for (i = 0; i < mapsize; i++) {
 317          fvalues[i] = USHORT_TO_FLOAT( values[i] );
 318       }
 319    }
 320
 321    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 322
 323    store_pixelmap(ctx, map, mapsize, fvalues);
 324 }
 325
 326
 327 static void GLAPIENTRY
 328 _mesa_GetPixelMapfv( GLenum map, GLfloat *values )
 329 {
 330    GET_CURRENT_CONTEXT(ctx);
 331    GLuint mapsize, i;
 332    const struct gl_pixelmap *pm;
 333
 334    ASSERT_OUTSIDE_BEGIN_END(ctx);
 335
 336    pm = get_pixelmap(ctx, map);
 337    if (!pm) {
 338       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapfv(map)");
 339       return;
 340    }
 341
 342    mapsize = pm->Size;
 343
 344    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize,
 345                             GL_INTENSITY, GL_FLOAT, values)) {
 346       return;
 347    }
 348
 349    values = (GLfloat *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 350    if (!values) {
 351       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 352          _mesa_error(ctx, GL_INVALID_OPERATION,
 353                      "glGetPixelMapfv(PBO is mapped)");
 354       }
 355       return;
 356    }
 357
 358    if (map == GL_PIXEL_MAP_S_TO_S) {
 359       /* special case */
 360       for (i = 0; i < mapsize; i++) {
 361          values[i] = (GLfloat) ctx->PixelMaps.StoS.Map[i];
 362       }
 363    }
 364    else {
 365       memcpy(values, pm->Map, mapsize * sizeof(GLfloat));
 366    }
 367
 368    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 369 }
 370
 371
 372 static void GLAPIENTRY
 373 _mesa_GetPixelMapuiv( GLenum map, GLuint *values )
 374 {
 375    GET_CURRENT_CONTEXT(ctx);
 376    GLint mapsize, i;
 377    const struct gl_pixelmap *pm;
 378
 379    ASSERT_OUTSIDE_BEGIN_END(ctx);
 380
 381    pm = get_pixelmap(ctx, map);
 382    if (!pm) {
 383       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapuiv(map)");
 384       return;
 385    }
 386    mapsize = pm->Size;
 387
 388    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize,
 389                             GL_INTENSITY, GL_UNSIGNED_INT, values)) {
 390       return;
 391    }
 392
 393    values = (GLuint *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 394    if (!values) {
 395       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 396          _mesa_error(ctx, GL_INVALID_OPERATION,
 397                      "glGetPixelMapuiv(PBO is mapped)");
 398       }
 399       return;
 400    }
 401
 402    if (map == GL_PIXEL_MAP_S_TO_S) {
 403       /* special case */
 404       memcpy(values, ctx->PixelMaps.StoS.Map, mapsize * sizeof(GLint));
 405    }
 406    else {
 407       for (i = 0; i < mapsize; i++) {
 408          values[i] = FLOAT_TO_UINT( pm->Map[i] );
 409       }
 410    }
 411
 412    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 413 }
 414
 415
 416 static void GLAPIENTRY
 417 _mesa_GetPixelMapusv( GLenum map, GLushort *values )
 418 {
 419    GET_CURRENT_CONTEXT(ctx);
 420    GLint mapsize, i;
 421    const struct gl_pixelmap *pm;
 422
 423    ASSERT_OUTSIDE_BEGIN_END(ctx);
 424
 425    pm = get_pixelmap(ctx, map);
 426    if (!pm) {
 427       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
 428       return;
 429    }
 430    mapsize = pm->Size;
 431
 432    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize,
 433                             GL_INTENSITY, GL_UNSIGNED_SHORT, values)) {
 434       return;
 435    }
 436
 437    values = (GLushort *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 438    if (!values) {
 439       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 440          _mesa_error(ctx, GL_INVALID_OPERATION,
 441                      "glGetPixelMapusv(PBO is mapped)");
 442       }
 443       return;
 444    }
 445
 446    switch (map) {
 447    /* special cases */
 448    case GL_PIXEL_MAP_I_TO_I:
 449       for (i = 0; i < mapsize; i++) {
 450          values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
 451       }
 452       break;
 453    case GL_PIXEL_MAP_S_TO_S:
 454       for (i = 0; i < mapsize; i++) {
 455          values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
 456       }
 457       break;
 458    default:
 459       for (i = 0; i < mapsize; i++) {
 460          CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
 461       }
 462    }
 463
 464    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 465 }
 466
 467
 468
 469 /**********************************************************************/
 470 /*****                       glPixelTransfer                      *****/
 471 /**********************************************************************/
 472
 473
 474 /*
 475  * Implements glPixelTransfer[fi] whether called immediately or from a
 476  * display list.
 477  */
 478 static void GLAPIENTRY
 479 _mesa_PixelTransferf( GLenum pname, GLfloat param )
 480 {
 481    GET_CURRENT_CONTEXT(ctx);
 482    ASSERT_OUTSIDE_BEGIN_END(ctx);
 483
 484    switch (pname) {
 485       case GL_MAP_COLOR:
 486          if (ctx->Pixel.MapColorFlag == (param ? GL_TRUE : GL_FALSE))
 487             return;
 488          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 489          ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
 490          break;
 491       case GL_MAP_STENCIL:
 492          if (ctx->Pixel.MapStencilFlag == (param ? GL_TRUE : GL_FALSE))
 493             return;
 494          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 495          ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
 496          break;
 497       case GL_INDEX_SHIFT:
 498          if (ctx->Pixel.IndexShift == (GLint) param)
 499             return;
 500          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 501          ctx->Pixel.IndexShift = (GLint) param;
 502          break;
 503       case GL_INDEX_OFFSET:
 504          if (ctx->Pixel.IndexOffset == (GLint) param)
 505             return;
 506          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 507          ctx->Pixel.IndexOffset = (GLint) param;
 508          break;
 509       case GL_RED_SCALE:
 510          if (ctx->Pixel.RedScale == param)
 511             return;
 512          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 513          ctx->Pixel.RedScale = param;
 514          break;
 515       case GL_RED_BIAS:
 516          if (ctx->Pixel.RedBias == param)
 517             return;
 518          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 519          ctx->Pixel.RedBias = param;
 520          break;
 521       case GL_GREEN_SCALE:
 522          if (ctx->Pixel.GreenScale == param)
 523             return;
 524          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 525          ctx->Pixel.GreenScale = param;
 526          break;
 527       case GL_GREEN_BIAS:
 528          if (ctx->Pixel.GreenBias == param)
 529             return;
 530          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 531          ctx->Pixel.GreenBias = param;
 532          break;
 533       case GL_BLUE_SCALE:
 534          if (ctx->Pixel.BlueScale == param)
 535             return;
 536          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 537          ctx->Pixel.BlueScale = param;
 538          break;
 539       case GL_BLUE_BIAS:
 540          if (ctx->Pixel.BlueBias == param)
 541             return;
 542          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 543          ctx->Pixel.BlueBias = param;
 544          break;
 545       case GL_ALPHA_SCALE:
 546          if (ctx->Pixel.AlphaScale == param)
 547             return;
 548          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 549          ctx->Pixel.AlphaScale = param;
 550          break;
 551       case GL_ALPHA_BIAS:
 552          if (ctx->Pixel.AlphaBias == param)
 553             return;
 554          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 555          ctx->Pixel.AlphaBias = param;
 556          break;
 557       case GL_DEPTH_SCALE:
 558          if (ctx->Pixel.DepthScale == param)
 559             return;
 560          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 561          ctx->Pixel.DepthScale = param;
 562          break;
 563       case GL_DEPTH_BIAS:
 564          if (ctx->Pixel.DepthBias == param)
 565             return;
 566          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 567          ctx->Pixel.DepthBias = param;
 568          break;
 569       case GL_POST_CONVOLUTION_RED_SCALE:
 570          if (ctx->Pixel.PostConvolutionScale[0] == param)
 571             return;
 572          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 573          ctx->Pixel.PostConvolutionScale[0] = param;
 574          break;
 575       case GL_POST_CONVOLUTION_RED_BIAS:
 576          if (ctx->Pixel.PostConvolutionBias[0] == param)
 577             return;
 578          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 579          ctx->Pixel.PostConvolutionBias[0] = param;
 580          break;
 581       case GL_POST_CONVOLUTION_GREEN_SCALE:
 582          if (ctx->Pixel.PostConvolutionScale[1] == param)
 583             return;
 584          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 585          ctx->Pixel.PostConvolutionScale[1] = param;
 586          break;
 587       case GL_POST_CONVOLUTION_GREEN_BIAS:
 588          if (ctx->Pixel.PostConvolutionBias[1] == param)
 589             return;
 590          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 591          ctx->Pixel.PostConvolutionBias[1] = param;
 592          break;
 593       case GL_POST_CONVOLUTION_BLUE_SCALE:
 594          if (ctx->Pixel.PostConvolutionScale[2] == param)
 595             return;
 596          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 597          ctx->Pixel.PostConvolutionScale[2] = param;
 598          break;
 599       case GL_POST_CONVOLUTION_BLUE_BIAS:
 600          if (ctx->Pixel.PostConvolutionBias[2] == param)
 601             return;
 602          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 603          ctx->Pixel.PostConvolutionBias[2] = param;
 604          break;
 605       case GL_POST_CONVOLUTION_ALPHA_SCALE:
 606          if (ctx->Pixel.PostConvolutionScale[3] == param)
 607             return;
 608          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 609          ctx->Pixel.PostConvolutionScale[3] = param;
 610          break;
 611       case GL_POST_CONVOLUTION_ALPHA_BIAS:
 612          if (ctx->Pixel.PostConvolutionBias[3] == param)
 613             return;
 614          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 615          ctx->Pixel.PostConvolutionBias[3] = param;
 616          break;
 617       default:
 618          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
 619          return;
 620    }
 621 }
 622
 623
 624 static void GLAPIENTRY
 625 _mesa_PixelTransferi( GLenum pname, GLint param )
 626 {
 627    _mesa_PixelTransferf( pname, (GLfloat) param );
 628 }
 629
 630
 631
 632 /**********************************************************************/
 633 /*****                    State Management                        *****/
 634 /**********************************************************************/
 635
 636 /*
 637  * Return a bitmask of IMAGE_*_BIT flags which to indicate which
 638  * pixel transfer operations are enabled.
 639  */
 640 static void
 641 update_image_transfer_state(GLcontext *ctx)
 642 {
 643    GLuint mask = 0;
 644
 645    if (ctx->Pixel.RedScale   != 1.0F || ctx->Pixel.RedBias   != 0.0F ||
 646        ctx->Pixel.GreenScale != 1.0F || ctx->Pixel.GreenBias != 0.0F ||
 647        ctx->Pixel.BlueScale  != 1.0F || ctx->Pixel.BlueBias  != 0.0F ||
 648        ctx->Pixel.AlphaScale != 1.0F || ctx->Pixel.AlphaBias != 0.0F)
 649       mask |= IMAGE_SCALE_BIAS_BIT;
 650
 651    if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset)
 652       mask |= IMAGE_SHIFT_OFFSET_BIT;
 653
 654    if (ctx->Pixel.MapColorFlag)
 655       mask |= IMAGE_MAP_COLOR_BIT;
 656
 657    if (ctx->Pixel.Convolution1DEnabled ||
 658        ctx->Pixel.Convolution2DEnabled ||
 659        ctx->Pixel.Separable2DEnabled) {
 660       mask |= IMAGE_CONVOLUTION_BIT;
 661       if (ctx->Pixel.PostConvolutionScale[0] != 1.0F ||
 662           ctx->Pixel.PostConvolutionScale[1] != 1.0F ||
 663           ctx->Pixel.PostConvolutionScale[2] != 1.0F ||
 664           ctx->Pixel.PostConvolutionScale[3] != 1.0F ||
 665           ctx->Pixel.PostConvolutionBias[0] != 0.0F ||
 666           ctx->Pixel.PostConvolutionBias[1] != 0.0F ||
 667           ctx->Pixel.PostConvolutionBias[2] != 0.0F ||
 668           ctx->Pixel.PostConvolutionBias[3] != 0.0F) {
 669          mask |= IMAGE_POST_CONVOLUTION_SCALE_BIAS;
 670       }
 671    }
 672
 673    ctx->_ImageTransferState = mask;
 674 }
 675
 676
 677 /**
 678  * Update mesa pixel transfer derived state.
 679  */
 680 void _mesa_update_pixel( GLcontext *ctx, GLuint new_state )
 681 {
 682    if (new_state & _MESA_NEW_TRANSFER_STATE)
 683       update_image_transfer_state(ctx);
 684 }
 685
 686
 687 void
 688 _mesa_init_pixel_dispatch(struct _glapi_table *disp)
 689 {
 690    SET_GetPixelMapfv(disp, _mesa_GetPixelMapfv);
 691    SET_GetPixelMapuiv(disp, _mesa_GetPixelMapuiv);
 692    SET_GetPixelMapusv(disp, _mesa_GetPixelMapusv);
 693    SET_PixelMapfv(disp, _mesa_PixelMapfv);
 694    SET_PixelMapuiv(disp, _mesa_PixelMapuiv);
 695    SET_PixelMapusv(disp, _mesa_PixelMapusv);
 696    SET_PixelTransferf(disp, _mesa_PixelTransferf);
 697    SET_PixelTransferi(disp, _mesa_PixelTransferi);
 698    SET_PixelZoom(disp, _mesa_PixelZoom);
 699 }
 700
 701
 702 #endif /* FEATURE_pixel_transfer */
 703
 704
 705 /**********************************************************************/
 706 /*****                      Initialization                        *****/
 707 /**********************************************************************/
 708
 709 static void
 710 init_pixelmap(struct gl_pixelmap *map)
 711 {
 712    map->Size = 1;
 713    map->Map[0] = 0.0;
 714    map->Map8[0] = 0;
 715 }
 716
 717
 718 /**
 719  * Initialize the context's PIXEL attribute group.
 720  */
 721 void
 722 _mesa_init_pixel( GLcontext *ctx )
 723 {
 724    int i;
 725
 726    /* Pixel group */
 727    ctx->Pixel.RedBias = 0.0;
 728    ctx->Pixel.RedScale = 1.0;
 729    ctx->Pixel.GreenBias = 0.0;
 730    ctx->Pixel.GreenScale = 1.0;
 731    ctx->Pixel.BlueBias = 0.0;
 732    ctx->Pixel.BlueScale = 1.0;
 733    ctx->Pixel.AlphaBias = 0.0;
 734    ctx->Pixel.AlphaScale = 1.0;
 735    ctx->Pixel.DepthBias = 0.0;
 736    ctx->Pixel.DepthScale = 1.0;
 737    ctx->Pixel.IndexOffset = 0;
 738    ctx->Pixel.IndexShift = 0;
 739    ctx->Pixel.ZoomX = 1.0;
 740    ctx->Pixel.ZoomY = 1.0;
 741    ctx->Pixel.MapColorFlag = GL_FALSE;
 742    ctx->Pixel.MapStencilFlag = GL_FALSE;
 743    init_pixelmap(&ctx->PixelMaps.StoS);
 744    init_pixelmap(&ctx->PixelMaps.ItoI);
 745    init_pixelmap(&ctx->PixelMaps.ItoR);
 746    init_pixelmap(&ctx->PixelMaps.ItoG);
 747    init_pixelmap(&ctx->PixelMaps.ItoB);
 748    init_pixelmap(&ctx->PixelMaps.ItoA);
 749    init_pixelmap(&ctx->PixelMaps.RtoR);
 750    init_pixelmap(&ctx->PixelMaps.GtoG);
 751    init_pixelmap(&ctx->PixelMaps.BtoB);
 752    init_pixelmap(&ctx->PixelMaps.AtoA);
 753    ctx->Pixel.Convolution1DEnabled = GL_FALSE;
 754    ctx->Pixel.Convolution2DEnabled = GL_FALSE;
 755    ctx->Pixel.Separable2DEnabled = GL_FALSE;
 756    for (i = 0; i < 3; i++) {
 757       ASSIGN_4V(ctx->Pixel.ConvolutionBorderColor[i], 0.0, 0.0, 0.0, 0.0);
 758       ctx->Pixel.ConvolutionBorderMode[i] = GL_REDUCE;
 759       ASSIGN_4V(ctx->Pixel.ConvolutionFilterScale[i], 1.0, 1.0, 1.0, 1.0);
 760       ASSIGN_4V(ctx->Pixel.ConvolutionFilterBias[i], 0.0, 0.0, 0.0, 0.0);
 761    }
 762    for (i = 0; i < MAX_CONVOLUTION_WIDTH * MAX_CONVOLUTION_WIDTH * 4; i++) {
 763       ctx->Convolution1D.Filter[i] = 0.0;
 764       ctx->Convolution2D.Filter[i] = 0.0;
 765       ctx->Separable2D.Filter[i] = 0.0;
 766    }
 767    ASSIGN_4V(ctx->Pixel.PostConvolutionScale, 1.0, 1.0, 1.0, 1.0);
 768    ASSIGN_4V(ctx->Pixel.PostConvolutionBias, 0.0, 0.0, 0.0, 0.0);
 769    /* GL_SGI_texture_color_table */
 770    ASSIGN_4V(ctx->Pixel.TextureColorTableScale, 1.0, 1.0, 1.0, 1.0);
 771    ASSIGN_4V(ctx->Pixel.TextureColorTableBias, 0.0, 0.0, 0.0, 0.0);
 772
 773    if (ctx->Visual.doubleBufferMode) {
 774       ctx->Pixel.ReadBuffer = GL_BACK;
 775    }
 776    else {
 777       ctx->Pixel.ReadBuffer = GL_FRONT;
 778    }
 779
 780    /* Miscellaneous */
 781    ctx->_ImageTransferState = 0;
 782 }